In the latest download (6.1.0.1),
1) The split behavior has been modified to truncate the item title at the MaxCharsForItemTitle registry setting (which also trims partial words and truncates at first newline).
2) When joining, whether item titles are included is now determined by registry setting IncludeItemTitleOnJoin.
See
https://kinook.com/Forum/showthread.php?t=5670 for more details.
Split/join functionality is not supported during drag/drop.